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Char Fields [ ]

Jul 19, 2012 at 7:55pm
QIZI94 (18)
Hi guys, I was looking for some tutorial or topic on google, but i didn't find it.

I need some function or something to determine how many fields are used,
for example:

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#include <iostream>

int main(){
  int NumberOfFields;
  wchar_t ch[30];//or char ch[30];

    //1234 fields of 30
  ch="abcd";

  NumberOfFields=SomeFunction(ch);

  cout<<"Number Of Fields: "<<ch;

  return 0;
}
Edit & run on cpp.sh



   Number of fields: 4 //of 30


Can somebody help me ?
Last edited on Jul 19, 2012 at 7:56pm
Jul 19, 2012 at 8:15pm
vlad from moscow (6539)
To determing the length of a char or wchar_t array you can use either strlen function from <cstring> or wcslen function from <cwchar>.
Also array in C/C++ has no the assignment operator. So you can not use

ch="abcd";

you should use either strcpy or wcscpy to copy a string literal to a character array.
Last edited on Jul 19, 2012 at 8:18pm
Jul 19, 2012 at 8:17pm
jwijnker (8)
Jul 19, 2012 at 8:20pm
Stewbond (2827)
If you're using C++ strings it's easy: 

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#include <string>
#include <iostream>

int main() {
  int NumberOfFields;
  std::wstring ch = "abcd";

  NumberOfFields=ch.size();

  cout<<"Number Of Fields: "<<NumberOfFields;

  return 0;
}
Edit & run on cpp.sh


If you really want to use character arrays, look for the terminating character. Whenever you use double-quotes in C++, there is a hidden character at the end '\0';

So in your case: 
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#include <iostream>

int SomeFunction(wchar_t* ChArray)
{
  int i;
  for (i = 0; i < 30; ++i)
    if (ChArray[i] == '\0')
      return i;
  return -1; // Error code
}

int main(){
  int NumberOfFields;
  wchar_t ch[30] = "abcd";//or char ch[30];

  NumberOfFields=SomeFunction(ch);

  cout<<"Number Of Fields: "<<ch;

  return 0;
}
Edit & run on cpp.sh
Last edited on Jul 19, 2012 at 8:25pm
Jul 20, 2012 at 6:36pm
QIZI94 (18)
Thanks guys it was useful :)
Last edited on Jul 20, 2012 at 6:38pm
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